A new rerouting approach for vehicular transit is introduced. The approach is illustrated with a real world scenario and evaluated through a hardware-in-the-loop simulation platform.
ISBN:
(纸本)9781479967308
A new rerouting approach for vehicular transit is introduced. The approach is illustrated with a real world scenario and evaluated through a hardware-in-the-loop simulation platform.
Modeling and simulation for development, test and optimization of control concepts are well known, effective methods to reduce costs and shorten development time. Currently there are only a few applications in the pro...
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ISBN:
(纸本)9783180920320
Modeling and simulation for development, test and optimization of control concepts are well known, effective methods to reduce costs and shorten development time. Currently there are only a few applications in the process industry, because of the high costs of implementation and the low flexibility of the simulation systems available. These disadvantages are to be overcome by the use of appropriate control concepts and suitable simulation tools. This paper describes a conception providing fully automatic configuration of simulation environment including MatLab/Simulink interface from the engineering data, thus making the simulation available for the entire life cycle of a process control system.
A hardware-in-the-loop simulation (HILS) system is presented for mid and terminal guidance simulation of precise imaging auto target recognizing (ATR) missiles. The system provided a simulation platform supporting the...
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ISBN:
(纸本)9781424417865
A hardware-in-the-loop simulation (HILS) system is presented for mid and terminal guidance simulation of precise imaging auto target recognizing (ATR) missiles. The system provided a simulation platform supporting the researches of ATR theories and designations of remote precise missiles. This distributed HILS system uses a multi-solution communication architecture between nodes of different real-time and expandability demands. The main simulation nodes includes the missile model node, the ATR processing node, the scene generate node and 2DOF rotary platform system, and the other auxiliary nodes can be added into the system a smart way. Most of the main nodes were developed in Windows and are open and expandable. RTX SDK was used to solve the Windows real-time problem. Lastly, a simulation instance is proposed to show the overall features of the system.
hardware-In-the-loop (HIL) simulations are more and more used to assess performances of electric drives. Software simulations lead to develop control of the studied system. In this case generally a lot of simplificati...
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ISBN:
(纸本)9781424416653
hardware-In-the-loop (HIL) simulations are more and more used to assess performances of electric drives. Software simulations lead to develop control of the studied system. In this case generally a lot of simplifications are assumed to reduce the computation time. Before a real-time implementation of the control, HIL simulations could be a very useful intermediary step. Thus a hardware device is introduced in the loop in order to take its real constraints into account. In this paper, three different kinds of HIL simulation are suggested: signal level, power level, and mechanical level. A example is given for the traction system of an electric scooter.
Fast and accurate reproduction of the radar signature of a target is important for many radar applications, such as target identification and hardware-in-the-loop simulations. Real-world targets are electrically large...
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Fast and accurate reproduction of the radar signature of a target is important for many radar applications, such as target identification and hardware-in-the-loop simulations. Real-world targets are electrically large, and the Nyquist criteria require fine sampling in frequency and angle to fully characterize the radar signature. Because of the fine sampling requirement, acquiring the radar signature is time and memory intensive. Even though fine sampling is required in the frequency and angle domains, most targets are sparse in a point scatter domain. This paper shows that the Nyquist criteria can be overcome through compressed sensing theory by leveraging the point scatter representation of a target. This greatly reduces the amount of data needed to characterize the radar signature for these defense applications.
The performance of a real-time multibody dynamics simulation using linearized constraint equations is discussed. It is known that a small step size is required to simulate a system with very stiff elements such as rub...
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The performance of a real-time multibody dynamics simulation using linearized constraint equations is discussed. It is known that a small step size is required to simulate a system with very stiff elements such as rubber bushes or a system with high frequency phenomena. Calculation time can be reduced by linearizing constraint equations, and high-speed multibody dynamic analysis with a smaller step size is realized. It is important to acknowledge the degree of accuracy lost when linearized constraint equations are used. We compare linearized and non-linearized simulation models using a model of an actual vehicle and ISO-8608 road profile classifications. Calculation time is evaluated in a real-time analysis environment, and the accuracy of the simulation result is examined. (C) 2013 Elsevier Ltd. All rights reserved.
As the applications of mobile robotics evolve it has become increasingly less practical for researchers to design custom hardware and control systems for each problem. This paper presents a new approach to control sys...
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As the applications of mobile robotics evolve it has become increasingly less practical for researchers to design custom hardware and control systems for each problem. This paper presents a new approach to control system design in order to look beyond end-of-lifecycle performance, and consider control system structure, flexibility, and extensibility. Towards these ends the Control ad libitum philosophy was proposed, stating that to make significant progress in the real-world application of mobile robot teams the control system must be structured such that teams can be formed in real-time from diverse components. The Control ad libitum philosophy was applied to the design of the HAA (Host, Avatar, Agent) architecture: a modular hierarchical framework built with provably correct distributed algorithms. A control system for mapping, exploration, and foraging was developed using the HAA architecture and evaluated in three experiments. First, the basic functionality of the HAA architecture was studied, specifically the ability to: (a) dynamically form the control system, (b) dynamically form the robot team, (c) dynamically form the processing network, and (d) handle heterogeneous teams and allocate robots between tasks based on their capabilities. Secondly, the control system was tested with different rates of software failure and was able to successfully complete its tasks even when each module was set to fail every 0.5-1.5 min. Thirdly, the control system was subjected to concurrent software and hardware failures, and was still able to complete a foraging task in a 216 m(2) environment. (C) 2013 Elsevier B.V. All rights reserved.
Designing of fuzzy if-then rules and tuning of membership function are difficult problems because of troublesome characteristics of engine idle speed such as severe process nonlinearities, variable time delay, time va...
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ISBN:
(纸本)9781424421138
Designing of fuzzy if-then rules and tuning of membership function are difficult problems because of troublesome characteristics of engine idle speed such as severe process nonlinearities, variable time delay, time variations and unobservable system states. To solve this key issue, an electronic throttle idle speed control strategy based on adaptive network-based fuzzy inference system (ANFIS) is proposed. The simulation model of idle speed controller and engine is built with the tool of MATLAB/SIMULINK. The validity of the control scheme is real-time simulation tested on the electronic throttle hardware-in-the-loop simulation system based on MATLAB/xPC Target. The real-time simulation results show that-the idle speed control strategy based on ANFIS has relatively little static errors with better dynamical performance and meet the stability requirements of engine idle speed control. hardware-in-the-loop simulation system based on xPC Target provides a friendly experiment environment for designing and testing of idle speed controller, and the development period is shortened.
This study presents a component-level failure detection and identification (FDI) algorithm for a cascade mechanical system subsuming a plant driven by an actuator unit. The novelty of the FDI algorithm presented in th...
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This study presents a component-level failure detection and identification (FDI) algorithm for a cascade mechanical system subsuming a plant driven by an actuator unit. The novelty of the FDI algorithm presented in this study is that it is able to discriminate failure occurring in the actuator unit, the sensor measuring the output of the actuator unit, and the plant driven by the actuator unit. The proposed FDI algorithm exploits the measurement of the actuator unit output together with its estimates generated by open-loop (OL) and closed-loop (CL) estimators to enable FDI at the component's level. In this study, the OL estimator is designed based on the system identification of the actuator unit. The CL estimator, which is guaranteed to be stable against variations in the plant, is synthesized based on the dynamics of the entire cascade system. The viability of the proposed algorithm is demonstrated using a hardware-in-the-loop simulation (HILS), which shows that it can detect and identify target failures reliably in the presence of plant uncertainties. (C) 2012 Elsevier Ltd. All rights reserved.
This paper presents the development of a systems-on-chip approach to speed up the simulation of wheelrail contact laws, which can be used to reduce the requirement for high-performance computers and enable simulation ...
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This paper presents the development of a systems-on-chip approach to speed up the simulation of wheelrail contact laws, which can be used to reduce the requirement for high-performance computers and enable simulation in real time for the use of hardware-in-loop for experimental studies of the latest vehicle dynamic and control technologies. The wheelrail contact laws are implemented using a field programmable gate array (FPGA) device with a design that substantially outperforms modern general-purpose PC platforms or fixed architecture digital signal processor devices in terms of processing time, configuration flexibility and cost. In order to utilise the FPGA's parallel-processing capability, the operations in the contact laws algorithms are arranged in a parallel manner and multi-contact patches are tackled simultaneously in the design. The interface between the FPGA device and the host PC is achieved by using a high-throughput and low-latency Ethernet link. The development is based on FASTSIM algorithms, although the design can be adapted and expanded for even more computationally demanding tasks.
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